Anonymous It is not a dummy it, right? It is a dummy pronoun, filling the direct object position for the extraposed ‘ to -clause’. This is because such clauses don’t (at least not normally) function as object.
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AnonymousIt is not a dummy it, right?It is a dummy pronoun, filling the direct object position for the extraposed ‘to-clause’. This is because such clauses don’t (at least not normally) function as object. Thus we couldn’t say *which makes to walk difficult.
AnonymousSo it is obligatory, right? I cannot say "I am always feeling tired, which makes difficult to get a good job," but need to say "I am always feeling tired, which makes it difficult to get a good job", right?Yes; dummy it is an integral part of extraposition. You can’t just move the clause to the end of the sentence and leave the object position
Anonymous not sure yet about the logic behind it.That’s because there is none. It’s just the way it is.
AnonymousDo you know some extra material covering this subject?Yes: The Cambridge Grammar of the English Language. If you register I’ll PM you the relevant pages (or you may be able to find them online yourself).